I'd create a Scriptrunner postfunction on the initial transition of the sub-task (e.g. create-transition).
The script would do this:
If type==subtask then get status of parent issue and transition the issue (sub-task) to the same status. That should be possible, but I have not yet written a script that transitions an issue.
You'll have to be careful however. The sub-task needs to have all the same status as the parents, so best to make sure they use the same workflow.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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